Date: Fri, 25 Sep 2015 11:37:39 +0300 From: Daniel Braniss <danny@cs.huji.ac.il> To: Ian Lepore <ian@FreeBSD.org> Cc: Hans Petter Selasky <hps@selasky.org>, freebsd-arm@freebsd.org, Rick Macklem <rmacklem@FreeBSD.org> Subject: Re: NFS Root with Raspberry Pi (nfs_diskless: no interface) Message-ID: <FE458AF3-A9EE-46B1-89E3-1FB82E413E17@cs.huji.ac.il> In-Reply-To: <1443142468.1224.322.camel@freebsd.org> References: <20150922052522.GA62140@gmail.com> <00C49FEB-E8EF-4469-85E2-0F901215CD11@cs.huji.ac.il> <20150923050414.GB43653@gmail.com> <91AAC64E-4C38-47AA-8910-48F7654A7524@cs.huji.ac.il> <20150923174445.GE43653@gmail.com> <CFAAFAE2-F0B2-431B-93C6-61D66464B7FD@cs.huji.ac.il> <1443105426.1224.272.camel@freebsd.org> <20150924163658.GC32257@gmail.com> <560438C5.3090404@selasky.org> <1443142468.1224.322.camel@freebsd.org>
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> On 25 Sep 2015, at 03:54, Ian Lepore <ian@FreeBSD.org> wrote:
>=20
> On Thu, 2015-09-24 at 19:54 +0200, Hans Petter Selasky wrote:
>> On 09/24/15 18:36, Randy Westlund wrote:
>>> On Thu, Sep 24, 2015 at 08:37:06AM -0600, Ian Lepore wrote:
>>=20
>>>>> [orig problem description: basically nfsroot without BOOTP fails]
>>=20
>>>> Try setting boot.netif.name=3D"ue0" in loader.conf. I've never =
tried
>>>> that, but in looking at the code, there's some chance it could =
work. :)
>>>>=20
>>>> What I do is put these options into my RPi kernel config:
>>>>=20
>>>> options BOOTP
>>>> options BOOTP_NFSROOT
>>>> options BOOTP_NFSV3
>>>> options BOOTP_WIRED_TO=3Due0
>>>>=20
>>>> But this requires configuring a bootp or dhcp server to provide the
>>>> info. It should be possible to netboot without using BOOTP.
>>>>=20
>>>> -- Ian
>>>=20
>>> No luck with boot.netif.name.
>>>=20
>>> I'm using the kernel that comes in the FreeBSD RPI-B disk image. Is
>>> there a way to see what it was built with? I tried running strings =
on
>>> the kernel, but I'm not sure what to look for. Otherwise I guess =
I'll
>>> build one myself.
>>>=20
>>> Randy
>>>=20
>>=20
>> Hi,
>>=20
>> The problem is that the code in:
>>=20
>> sys/nfs/bootp_subr.c: SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF,=20
>> SI_ORDER_FIRST, bootpc_init, NULL);
>>=20
>> doesn't wait for the USB ethernet device to be enumerated. Only the=20=
>> vfs_mountroot() code which is running from the init-process does so.
>>=20
>> Not sure what the best way to solve this is. Try putting:
>>=20
>> pause("W", hz * 4);
>>=20
>> Into the beginning of the "bootpc_init()" function.
>>=20
>> --HPS
>=20
> I had time to look into this today. The bootpc_init() routine *does*
> wait for an interface to appear. The problem in this case is that =
BOOTP
> isn't involved, and the nfs_setup_diskless() routine doesn't have a
> similar wait loop for slow interfaces. The attached patch adds it, =
and
> with it I can nfsmount root on my RPi without using the BOOTP_foo
> options I listed above.
>=20
> Rick, does this patch look okay to you? If no objections, I'll commit
> this asap.
>=20
> -- Ian
>=20
> Index: sys/nfs/nfs_diskless.c
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- sys/nfs/nfs_diskless.c (revision 288203)
> +++ sys/nfs/nfs_diskless.c (working copy)
> @@ -57,6 +57,8 @@ __FBSDID("$FreeBSD$");
> #include <nfsclient/nfs.h>
> #include <nfs/nfsdiskless.h>
>=20
> +#define IFACE_TIMEOUT_SECS 10 /* Timeout for interface to =
appear. */
> +
> static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
> static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
> static int decode_nfshandle(char *ev, u_char *fh, int maxfh);
> @@ -170,6 +172,7 @@ nfs_setup_diskless(void)
> char *cp;
> int cnt, fhlen, is_nfsv3;
> uint32_t len;
> + time_t timeout_at;
>=20
> if (nfs_diskless_valid !=3D 0)
> return;
> @@ -214,6 +217,8 @@ nfs_setup_diskless(void)
> return;
> }
> ifa =3D NULL;
> + timeout_at =3D time_uptime + IFACE_TIMEOUT_SECS;
> +retry:
> CURVNET_SET(TD_TO_VNET(curthread));
> IFNET_RLOCK();
> TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
> @@ -234,6 +239,10 @@ nfs_setup_diskless(void)
> }
> IFNET_RUNLOCK();
> CURVNET_RESTORE();
> + if (time_uptime < timeout_at) {
> + pause("nfssdl", hz / 5);
> + goto retry;
> + }
> printf("nfs_diskless: no interface\n");
> return; /* no matching interface */
> match_done:
> _______________________________________________
hi Ian,
can you help me here?
I need the magics to get ubldr to boot from the net,
i=E2=80=99m using an image built via crochet.=20
cheers,
danny
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